/Engine/Plugins/Runtime/GameplayAbilities/Source/GameplayAbilities/Public/GameplayEffect.h
Attempts to populate the specified aggregator with a snapshot of the backing captured aggregator. Can fail if the spec doesn't have a valid capture yet.
True if the aggregator was successfully snapshotted, false if it was not
bool AttemptGetAttributeAggregatorSnapshot ( [FAggregator](API\Plugins\GameplayAbilities\FAggregator) & OutAggregatorSnapshot ) const